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As I sadly see no safety warning on the page of this “new toy” as it is described, here are the general precautions when working with lasers :
“- Everyone who uses a laser should be aware of the risks. This awareness is not just a matter of time spent with lasers; to the contrary, long-term dealing with invisible risks (such as from infrared laser beams) tends to reduce risk awareness, rather than to sharpen it.
- Optical experiments should be carried out on an optical table with all laser beams travelling in the horizontal plane only, and all beams should be stopped at the edges of the table. Users should never put their eyes at the level of the horizontal plane where the beams are in case of reflected beams that leave the table.
- Watches and other jewelry that might enter the optical plane should not be allowed in the laboratory. All non-optical objects that are close to the optical plane should have a matte finish in order to prevent specular reflections.
- Adequate eye protection should always be required for everyone in the room if there is a significant risk for eye injury.
- High-intensity beams that can cause fire or skin damage (mainly from class 4 and ultraviolet lasers) and that are not frequently modified should be guided through opaque tubes.
- Alignment of beams and optical components should be performed at a reduced beam power whenever possible.” (source)

Seems as if a shield that blocks the laser light could be designed into the system and interlocked so that the laser won’t fire until it is in place would mitigate the danger issue. Interlocks would be essential with the “woodcutting” version.